A new saw is just like a girl friend, if you rider her to at the beginning, she'll never make a good wife.
It always seemed to me it took a good month for the new saw to run like the old one.
I ran 32:1 all the time, the Stihl dealer recommended this.
I've always said a saw is as good as its owner.
This might sound foolish, i hated a new saw, i give to the help to break in, i had wood to lay down, not break in a saw.
After supper i'd take all the saws and blow'em out, clean air cleaners, just given an old school look over, make sure they were ready to go to work.
You take care of your saw, your saw will take care of you.